LC
-
37D44E/S/RU-BK/GY
4 – 1
LC37D44E-BK
Service Manual
CHAPTER 4.
TROUBLESHOOTING TABLE
[1] TROUBLESHOOTING TABLE
The sound is not emitted from the speaker though the picture has come out.
No sound output in all modes.?
Is the audio signal output of pins (28/L) and (27/R) of
IC3001 (MAIN_MICON) normal?
NO
Check IC3001 and its peripheral circuits.
YES
Is audio signal input to pin(5/L), pin(9/R) of IC2701(AMP)?
NO
Check the line between IC3001 and IC2701.
YES
Is MUTE circuit [MUTE_SP_LINE, RESET_N_LINE] nor-
mal?
NO
Check the MUTE_SP_LINE and RESET_N_LINE.
(Q2701, etc.)
YES
Is the audio signal output of pins (3, 4) (L-ch) and (2, 1)
(R-ch) of P2701(AOUDIO-CONNECTOR) normal?
NO
Check IC2701 and its peripheral circuits.
YES
Check Speaker (right and left) and wire harness.
No sound (during the reception of TV(ANALOG) broadcasting)
Does not the sound go out though the picture has come out when UHF/VHF is received?
Is the SIF signal output from pin (4) of TUNER (TU201)?
NO
Check the tuner and its peripheral circuits.
Replace as required.
YES
Is the SIF signal sent to pins (31) of IC3001
(MAIN_MICON)?
NO
Check the line between TU201 and IC3001.
YES
Refer to “No sound output in all modes”.
